Figure 8.
Requirement for ORR in systemic light signaling effects on the induction phase of photosynthesis in distal tomato leaves, including the time course of increases in net photosynthetic rate during photosynthetic induction, T50 or T90, CEF, H2O2 accumulation, and ATP accumulation in the fourth leaves. A and B, Time course of increases in net photosynthetic rate during photosynthetic induction and T50 or T90 in fourth leaves. Net photosynthetic rates are expressed as percentages of the maximum net photosynthetic rate. C and D, Effect of ORR silencing on CEF in the fourth leaves during photosynthetic induction. a.u., Arbitrary unit. E, Effect of ORR on H2O2 accumulation in the fourth leaves after preillumination of the apex with WL (L) at 300 μmol m−2 s−1 for 30 min. F, Effect of ORR on ATP accumulation in the fourth leaves during photosynthetic induction. Samples were harvested after the fourth leaves were exposed to L for 8 min with preillumination. D, Dark control. During the illumination treatments, the other parts of the plant were kept in darkness. Values are means of four plants ± sd. Different letters indicate significant differences at P < 0.05 according to Tukey’s test. Chl, Chlorophyll; FW, fresh weight.